i bought a 2nd hand quarter for my old clio for £25 but i never got round to taking it off. in the end i decided it would just be easier to buy a new one and fit it
ide say you could get it done for about 1k, maybe less maybe, more, depends where you go.
dont go to a big place as the labour costs will be extortionate. try small reputable bodyshops and get some quotes.